I need to certificate my site with https by this How To Secure Nginx with Let's Encrypt on Ubuntu 20.04 | DigitalOcean step 4 Is it possible that connecting my domain to the server IP needs some time to connect it with DNS, that's why it gives an error about DNS? My domain is: matrix.level.family …

Ok, then you need to include that www name in your web server - in the same place as the matrix name.

Certbot failed to authenticate some domains (authenticator: nginx)

rg305 September 13, 2023, 2:50pm 6

It might be shorter:
www.matrix

The zone "level.family" is implied.

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